The mechanical advantage is defined as the ratio between the force produced by a machine and the force applied in input:

For the crowbar of the problem, the force applied in input is 40 N, while the force produced in output is equal to the weight of the rock that is lifted, so 400 N. Therefore, the mechanical advantage is
The sun is bright and when its cold there is no sun
Answer:
the answer is kilograms
Explanation:
you would use kilograms to measure mass.
If an object is at equilibrium, the net force acting upon the object is 0 Newton.